在 PHP 中从 url 调用 pdf 时，Chrome 出现“加载 PDF 文档失败”错误消息。但适用于 Firefox 和 Edge

Question

我想使用 PHP 从浏览器中的 REST 服务的 URL 打开一个 pdf 文件，但该文件没有打开。 Chrome 说，“无法加载 PDF 文档”。但在 Firefox 和 Edge 中可以正常工作。

这是我的 print.php

<?php

header("Pragma: public"); // required
header('Content-Type: application/pdf');
header('Accept-Ranges: bytes');
header('Content-Transfer-Encoding: binary');

$data = ...; //definition of my json object

$baseUrl = 'http://www.website.com:8080/report/api/something/';
$newUrl = $baseUrl .'path';

$additional_headers = array(
    'Content-Type: application/json',
);

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, false);
curl_setopt($ch, CURLOPT_HTTPHEADER, $additional_headers);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

$server_output = curl_exec($ch);

echo  $server_output;

?>

更新

我注意到，当我的报告中的记录数量超过一定数量时会发生这种情况（始终在 chrome 中，其他浏览器可以正常工作）。但是我还是解决不了问题。

Answer 1

终于找到了解决办法！！！

首先，我更改了我的 CURL 调用，将 CURLOPT_RETURNTRANSFER 更改为 true 然后，使用 Postman 调用我的 PHP 页面，我注意到结果的内容是这样的：

<br />
<b>Deprecated</b>:  Automatically populating $HTTP_RAW_POST_DATA is deprecated and will be removed in a future version. To avoid this warning set 'always_populate_raw_post_data' to '-1' in php.ini and use the php://input stream instead. in
<b>Unknown</b> on line
<b>0</b>
<br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent in
<b>Unknown</b> on line
<b>0</b>
<br />
<br />
<b>Warning</b>:  session_start(): Cannot send session cookie - headers already sent in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>4</b>
<br />
<br />
<b>Warning</b>:  session_start(): Cannot send session cache limiter - headers already sent in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>4</b>
<br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>5</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>24</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
<br />
<b>Warning</b>:  Creating default object from empty value in
<b>C:\xampp\htdocs\project\print.php</b> on line
<b>77</b>
<br />
%PDF-1.5
%����
3 0 obj<
</ColorSpace/DeviceRGB/Subtype/Image/Height 515/Filter/DCTDecode/Type/XObject/Width 545/BitsPerComponent 8/Length 47996>>stream
���� ........................................... 

它是从 REST 服务正确下载的 PDF，但 PHP 显示太多错误，因此 Chrome 无法打开 PDF 文件（也是因为这个原因，当我的 PDF 文件的数据计数 error_reporting(0) 放在我的 PHP 文件顶部（显然更好地修复警告）：

<?php

error_reporting(0); // to prevent show warning or errors, use carefully

header("Pragma: public"); // required
header('Content-Type: application/pdf');
...

然后，当我再次执行我的 PHP 页面时，页面的内容（如果只有 PDF 文件）

%PDF-1.5
%����
3 0 obj<
</ColorSpace/DeviceRGB/Subtype/Image/Height 515/Filter/DCTDecode/Type/XObject/Width 545/BitsPerComponent 8/Length 47996>>stream
���� ...........................................